[Herb Stoops]

Quenten, I think you'll get your money's worth out of them. I have two cheapie sets and have used them dozens of times and as Chuck said, you can replace the most often used ones (if necessary) with something better.

I bought a cheapy set to use occasionally in the drill press. I found that the shanks are out of round with the cutters. I found that if I rotate them around and chucked them up that when I found the spot that they were chucked up to grind the cutters,I marked a spot on the chuck and the shank of the bit with a sharpie to always reference the position for future set ups. It has worked well for me. I too bought a set of diamond files for sharpening the bits to touch up the cutters and they are working OK now.
Herb

 

[Herb Stoops]

If you remember the plumbers years ago used the Greenly bits on a Milwaukee right angle drill motor to drill all the holes for the pipes to go thru the studs.
Herb